They were already shown leniency as they were not given a ticket when they deserved one. It is the duty of pensioners as well as everyone else to check for signage, not stroll along oblivious and assuming they can just cry about their situation and get off.
"Jaki" even said that she wanted to make things as easy as she could for him, this hints that she knew it was a staff car park.

yep sounds about right for all the sad *insert own word/s here* who work for vinci.
vinci signage is usually baldly placed (deliberately maybe)
ive seen them at 10 and 11 pm in Gloucester hospital placing tickets on cars in almost empty car parks,
certain words come to mind but they would get deleted.
vivnci are only interested in money and not there for the benefit of anyone other than themselves

No sympathy at all. The staff car park was clearly signed as staff. What has his terminal illness got to do with anything apart from trying to use it to again make parking companies look like demons?
It is clear that it is staff and as if the staff haven't heard that excuse a thousand times before.